diff -r 000000000000 -r 6474c204b198 content/canvas/src/WebGLExtensionDebugShaders.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/canvas/src/WebGLExtensionDebugShaders.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WebGLContext.h"
+#include "WebGLExtensions.h"
+#include "mozilla/dom/WebGLRenderingContextBinding.h"
+
+using namespace mozilla;
+
+WebGLExtensionDebugShaders::WebGLExtensionDebugShaders(WebGLContext* context)
+    : WebGLExtensionBase(context)
+{
+}
+
+WebGLExtensionDebugShaders::~WebGLExtensionDebugShaders()
+{
+}
+
+/* If no source has been defined, compileShader() has not been called,
+ * or the translation has failed for shader, an empty string is
+ * returned; otherwise, return the translated source.
+ */
+void
+WebGLExtensionDebugShaders::GetTranslatedShaderSource(WebGLShader* shader,
+                                                      nsAString& retval)
+{
+    if (mIsLost) {
+        return mContext->ErrorInvalidOperation("getTranslatedShaderSource: "
+                                               "Extension is lost.");
+    }
+
+    mContext->GetShaderTranslatedSource(shader, retval);
+
+    if (retval.IsVoid()) {
+        CopyASCIItoUTF16("", retval);
+    }
+}
+
+IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionDebugShaders)